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3a993e3d MA |
1 | ;;; dbus.el --- Elisp bindings for D-Bus. |
2 | ||
acaf905b | 3 | ;; Copyright (C) 2007-2012 Free Software Foundation, Inc. |
3a993e3d MA |
4 | |
5 | ;; Author: Michael Albinus <michael.albinus@gmx.de> | |
6 | ;; Keywords: comm, hardware | |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
874a927a | 10 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
3a993e3d | 11 | ;; it under the terms of the GNU General Public License as published by |
874a927a GM |
12 | ;; the Free Software Foundation, either version 3 of the License, or |
13 | ;; (at your option) any later version. | |
3a993e3d MA |
14 | |
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
874a927a | 21 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
3a993e3d MA |
22 | |
23 | ;;; Commentary: | |
24 | ||
25 | ;; This package provides language bindings for the D-Bus API. D-Bus | |
26 | ;; is a message bus system, a simple way for applications to talk to | |
27 | ;; one another. See <http://dbus.freedesktop.org/> for details. | |
28 | ||
29 | ;; Low-level language bindings are implemented in src/dbusbind.c. | |
30 | ||
dcbf5805 MA |
31 | ;; D-Bus support in the Emacs core can be disabled with configuration |
32 | ;; option "--without-dbus". | |
33 | ||
3a993e3d MA |
34 | ;;; Code: |
35 | ||
dcbf5805 MA |
36 | ;; Declare used subroutines and variables. |
37 | (declare-function dbus-message-internal "dbusbind.c") | |
ba6f7d86 | 38 | (declare-function dbus-init-bus "dbusbind.c") |
dcbf5805 MA |
39 | (defvar dbus-message-type-invalid) |
40 | (defvar dbus-message-type-method-call) | |
41 | (defvar dbus-message-type-method-return) | |
42 | (defvar dbus-message-type-error) | |
43 | (defvar dbus-message-type-signal) | |
6981d00a | 44 | (defvar dbus-debug) |
b172ed20 | 45 | (defvar dbus-registered-objects-table) |
6981d00a MA |
46 | |
47 | ;; Pacify byte compiler. | |
48 | (eval-when-compile | |
49 | (require 'cl)) | |
7bb7efbd | 50 | |
3a993e3d MA |
51 | (require 'xml) |
52 | ||
53 | (defconst dbus-service-dbus "org.freedesktop.DBus" | |
54 | "The bus name used to talk to the bus itself.") | |
55 | ||
56 | (defconst dbus-path-dbus "/org/freedesktop/DBus" | |
57 | "The object path used to talk to the bus itself.") | |
58 | ||
dcbf5805 MA |
59 | ;; Default D-Bus interfaces. |
60 | ||
3a993e3d | 61 | (defconst dbus-interface-dbus "org.freedesktop.DBus" |
dcbf5805 | 62 | "The interface exported by the service `dbus-service-dbus'.") |
3a993e3d | 63 | |
4ba11bcb | 64 | (defconst dbus-interface-peer (concat dbus-interface-dbus ".Peer") |
dcbf5805 MA |
65 | "The interface for peer objects. |
66 | See URL `http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-peer'.") | |
67 | ||
68 | ;; <interface name="org.freedesktop.DBus.Peer"> | |
69 | ;; <method name="Ping"> | |
70 | ;; </method> | |
71 | ;; <method name="GetMachineId"> | |
72 | ;; <arg name="machine_uuid" type="s" direction="out"/> | |
73 | ;; </method> | |
74 | ;; </interface> | |
4ba11bcb MA |
75 | |
76 | (defconst dbus-interface-introspectable | |
77 | (concat dbus-interface-dbus ".Introspectable") | |
dcbf5805 MA |
78 | "The interface supported by introspectable objects. |
79 | See URL `http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-introspectable'.") | |
3a993e3d | 80 | |
dcbf5805 MA |
81 | ;; <interface name="org.freedesktop.DBus.Introspectable"> |
82 | ;; <method name="Introspect"> | |
83 | ;; <arg name="data" type="s" direction="out"/> | |
84 | ;; </method> | |
85 | ;; </interface> | |
f636d3ca | 86 | |
dcbf5805 MA |
87 | (defconst dbus-interface-properties (concat dbus-interface-dbus ".Properties") |
88 | "The interface for property objects. | |
89 | See URL `http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-properties'.") | |
90 | ||
91 | ;; <interface name="org.freedesktop.DBus.Properties"> | |
92 | ;; <method name="Get"> | |
93 | ;; <arg name="interface" type="s" direction="in"/> | |
94 | ;; <arg name="propname" type="s" direction="in"/> | |
95 | ;; <arg name="value" type="v" direction="out"/> | |
96 | ;; </method> | |
97 | ;; <method name="Set"> | |
98 | ;; <arg name="interface" type="s" direction="in"/> | |
99 | ;; <arg name="propname" type="s" direction="in"/> | |
100 | ;; <arg name="value" type="v" direction="in"/> | |
101 | ;; </method> | |
102 | ;; <method name="GetAll"> | |
103 | ;; <arg name="interface" type="s" direction="in"/> | |
104 | ;; <arg name="props" type="a{sv}" direction="out"/> | |
105 | ;; </method> | |
106 | ;; <signal name="PropertiesChanged"> | |
107 | ;; <arg name="interface" type="s"/> | |
108 | ;; <arg name="changed_properties" type="a{sv}"/> | |
109 | ;; <arg name="invalidated_properties" type="as"/> | |
110 | ;; </signal> | |
111 | ;; </interface> | |
112 | ||
113 | (defconst dbus-interface-objectmanager | |
114 | (concat dbus-interface-dbus ".ObjectManager") | |
115 | "The object manager interface. | |
116 | See URL `http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-objectmanager'.") | |
117 | ||
118 | ;; <interface name="org.freedesktop.DBus.ObjectManager"> | |
119 | ;; <method name="GetManagedObjects"> | |
120 | ;; <arg name="object_paths_interfaces_and_properties" | |
121 | ;; type="a{oa{sa{sv}}}" direction="out"/> | |
122 | ;; </method> | |
123 | ;; <signal name="InterfacesAdded"> | |
124 | ;; <arg name="object_path" type="o"/> | |
125 | ;; <arg name="interfaces_and_properties" type="a{sa{sv}}"/> | |
126 | ;; </signal> | |
127 | ;; <signal name="InterfacesRemoved"> | |
128 | ;; <arg name="object_path" type="o"/> | |
129 | ;; <arg name="interfaces" type="as"/> | |
130 | ;; </signal> | |
131 | ;; </interface> | |
132 | ||
133 | ;; Emacs defaults. | |
65b7cb2c MA |
134 | (defconst dbus-service-emacs "org.gnu.Emacs" |
135 | "The well known service name of Emacs.") | |
136 | ||
137 | (defconst dbus-path-emacs "/org/gnu/Emacs" | |
dcbf5805 MA |
138 | "The object path namespace used by Emacs. |
139 | All object paths provided by the service `dbus-service-emacs' | |
140 | shall be subdirectories of this path.") | |
65b7cb2c | 141 | |
dcbf5805 MA |
142 | (defconst dbus-interface-emacs "org.gnu.Emacs" |
143 | "The interface namespace used by Emacs.") | |
98c38bfc | 144 | |
dcbf5805 | 145 | ;; D-Bus constants. |
98c38bfc | 146 | |
246a286b MA |
147 | (defmacro dbus-ignore-errors (&rest body) |
148 | "Execute BODY; signal D-Bus error when `dbus-debug' is non-nil. | |
149 | Otherwise, return result of last form in BODY, or all other errors." | |
f291fe60 | 150 | (declare (indent 0) (debug t)) |
246a286b MA |
151 | `(condition-case err |
152 | (progn ,@body) | |
153 | (dbus-error (when dbus-debug (signal (car err) (cdr err)))))) | |
246a286b MA |
154 | (font-lock-add-keywords 'emacs-lisp-mode '("\\<dbus-ignore-errors\\>")) |
155 | ||
e12c189f MA |
156 | (defvar dbus-event-error-hooks nil |
157 | "Functions to be called when a D-Bus error happens in the event handler. | |
f213fc09 | 158 | Every function must accept two arguments, the event and the error variable |
333f9019 | 159 | caught in `condition-case' by `dbus-error'.") |
e12c189f | 160 | |
5363d8ea | 161 | \f |
dcbf5805 | 162 | ;;; Basic D-Bus message functions. |
5363d8ea | 163 | |
98c38bfc MA |
164 | (defvar dbus-return-values-table (make-hash-table :test 'equal) |
165 | "Hash table for temporary storing arguments of reply messages. | |
dcbf5805 MA |
166 | A key in this hash table is a list (:serial BUS SERIAL), like in |
167 | `dbus-registered-objects-table'. BUS is either a Lisp symbol, | |
168 | `:system' or `:session', or a string denoting the bus address. | |
169 | SERIAL is the serial number of the reply message.") | |
170 | ||
171 | (defun dbus-call-method-handler (&rest args) | |
172 | "Handler for reply messages of asynchronous D-Bus message calls. | |
173 | It calls the function stored in `dbus-registered-objects-table'. | |
174 | The result will be made available in `dbus-return-values-table'." | |
175 | (puthash (list :serial | |
176 | (dbus-event-bus-name last-input-event) | |
177 | (dbus-event-serial-number last-input-event)) | |
178 | (if (= (length args) 1) (car args) args) | |
179 | dbus-return-values-table)) | |
180 | ||
181 | (defun dbus-call-method (bus service path interface method &rest args) | |
182 | "Call METHOD on the D-Bus BUS. | |
183 | ||
184 | BUS is either a Lisp symbol, `:system' or `:session', or a string | |
185 | denoting the bus address. | |
186 | ||
187 | SERVICE is the D-Bus service name to be used. PATH is the D-Bus | |
188 | object path SERVICE is registered at. INTERFACE is an interface | |
189 | offered by SERVICE. It must provide METHOD. | |
190 | ||
191 | If the parameter `:timeout' is given, the following integer TIMEOUT | |
192 | specifies the maximum number of milliseconds the method call must | |
193 | return. The default value is 25,000. If the method call doesn't | |
194 | return in time, a D-Bus error is raised. | |
195 | ||
196 | All other arguments ARGS are passed to METHOD as arguments. They are | |
197 | converted into D-Bus types via the following rules: | |
198 | ||
199 | t and nil => DBUS_TYPE_BOOLEAN | |
200 | number => DBUS_TYPE_UINT32 | |
201 | integer => DBUS_TYPE_INT32 | |
202 | float => DBUS_TYPE_DOUBLE | |
203 | string => DBUS_TYPE_STRING | |
204 | list => DBUS_TYPE_ARRAY | |
205 | ||
206 | All arguments can be preceded by a type symbol. For details about | |
207 | type symbols, see Info node `(dbus)Type Conversion'. | |
208 | ||
209 | `dbus-call-method' returns the resulting values of METHOD as a list of | |
210 | Lisp objects. The type conversion happens the other direction as for | |
211 | input arguments. It follows the mapping rules: | |
212 | ||
213 | DBUS_TYPE_BOOLEAN => t or nil | |
214 | DBUS_TYPE_BYTE => number | |
215 | DBUS_TYPE_UINT16 => number | |
216 | DBUS_TYPE_INT16 => integer | |
217 | DBUS_TYPE_UINT32 => number or float | |
218 | DBUS_TYPE_UNIX_FD => number or float | |
219 | DBUS_TYPE_INT32 => integer or float | |
220 | DBUS_TYPE_UINT64 => number or float | |
221 | DBUS_TYPE_INT64 => integer or float | |
222 | DBUS_TYPE_DOUBLE => float | |
223 | DBUS_TYPE_STRING => string | |
224 | DBUS_TYPE_OBJECT_PATH => string | |
225 | DBUS_TYPE_SIGNATURE => string | |
226 | DBUS_TYPE_ARRAY => list | |
227 | DBUS_TYPE_VARIANT => list | |
228 | DBUS_TYPE_STRUCT => list | |
229 | DBUS_TYPE_DICT_ENTRY => list | |
230 | ||
231 | Example: | |
232 | ||
233 | \(dbus-call-method | |
234 | :session \"org.gnome.seahorse\" \"/org/gnome/seahorse/keys/openpgp\" | |
235 | \"org.gnome.seahorse.Keys\" \"GetKeyField\" | |
236 | \"openpgp:657984B8C7A966DD\" \"simple-name\") | |
237 | ||
238 | => (t (\"Philip R. Zimmermann\")) | |
239 | ||
240 | If the result of the METHOD call is just one value, the converted Lisp | |
241 | object is returned instead of a list containing this single Lisp object. | |
242 | ||
243 | \(dbus-call-method | |
244 | :system \"org.freedesktop.Hal\" \"/org/freedesktop/Hal/devices/computer\" | |
245 | \"org.freedesktop.Hal.Device\" \"GetPropertyString\" | |
246 | \"system.kernel.machine\") | |
247 | ||
248 | => \"i686\"" | |
249 | ||
250 | (or (memq bus '(:system :session)) (stringp bus) | |
251 | (signal 'wrong-type-argument (list 'keywordp bus))) | |
252 | (or (stringp service) | |
253 | (signal 'wrong-type-argument (list 'stringp service))) | |
254 | (or (stringp path) | |
255 | (signal 'wrong-type-argument (list 'stringp path))) | |
256 | (or (stringp interface) | |
257 | (signal 'wrong-type-argument (list 'stringp interface))) | |
258 | (or (stringp method) | |
259 | (signal 'wrong-type-argument (list 'stringp method))) | |
260 | ||
261 | (let ((timeout (plist-get args :timeout)) | |
262 | (key | |
263 | (apply | |
264 | 'dbus-message-internal dbus-message-type-method-call | |
265 | bus service path interface method 'dbus-call-method-handler args))) | |
266 | ;; Wait until `dbus-call-method-handler' has put the result into | |
267 | ;; `dbus-return-values-table'. If no timeout is given, use the | |
268 | ;; default 25". | |
269 | (with-timeout ((if timeout (/ timeout 1000.0) 25)) | |
270 | (while (eq (gethash key dbus-return-values-table :ignore) :ignore) | |
271 | (read-event nil nil 0.1))) | |
272 | ||
273 | ;; Cleanup `dbus-return-values-table'. Return the result. | |
274 | (prog1 | |
275 | (gethash key dbus-return-values-table) | |
276 | (remhash key dbus-return-values-table)))) | |
277 | ||
278 | ;; `dbus-call-method' works non-blocking now. | |
279 | (defalias 'dbus-call-method-non-blocking 'dbus-call-method) | |
280 | (make-obsolete 'dbus-call-method-non-blocking 'dbus-call-method "24.2") | |
281 | ||
282 | (defun dbus-call-method-asynchronously | |
283 | (bus service path interface method handler &rest args) | |
284 | "Call METHOD on the D-Bus BUS asynchronously. | |
285 | ||
286 | BUS is either a Lisp symbol, `:system' or `:session', or a string | |
287 | denoting the bus address. | |
288 | ||
289 | SERVICE is the D-Bus service name to be used. PATH is the D-Bus | |
290 | object path SERVICE is registered at. INTERFACE is an interface | |
291 | offered by SERVICE. It must provide METHOD. | |
292 | ||
293 | HANDLER is a Lisp function, which is called when the corresponding | |
294 | return message has arrived. If HANDLER is nil, no return message | |
295 | will be expected. | |
296 | ||
297 | If the parameter `:timeout' is given, the following integer TIMEOUT | |
298 | specifies the maximum number of milliseconds the method call must | |
299 | return. The default value is 25,000. If the method call doesn't | |
300 | return in time, a D-Bus error is raised. | |
301 | ||
302 | All other arguments ARGS are passed to METHOD as arguments. They are | |
303 | converted into D-Bus types via the following rules: | |
304 | ||
305 | t and nil => DBUS_TYPE_BOOLEAN | |
306 | number => DBUS_TYPE_UINT32 | |
307 | integer => DBUS_TYPE_INT32 | |
308 | float => DBUS_TYPE_DOUBLE | |
309 | string => DBUS_TYPE_STRING | |
310 | list => DBUS_TYPE_ARRAY | |
311 | ||
312 | All arguments can be preceded by a type symbol. For details about | |
313 | type symbols, see Info node `(dbus)Type Conversion'. | |
314 | ||
315 | If HANDLER is a Lisp function, the function returns a key into the | |
316 | hash table `dbus-registered-objects-table'. The corresponding entry | |
317 | in the hash table is removed, when the return message has been arrived, | |
318 | and HANDLER is called. | |
319 | ||
320 | Example: | |
321 | ||
322 | \(dbus-call-method-asynchronously | |
323 | :system \"org.freedesktop.Hal\" \"/org/freedesktop/Hal/devices/computer\" | |
324 | \"org.freedesktop.Hal.Device\" \"GetPropertyString\" 'message | |
325 | \"system.kernel.machine\") | |
326 | ||
327 | => \(:serial :system 2) | |
328 | ||
329 | -| i686" | |
330 | ||
331 | (or (memq bus '(:system :session)) (stringp bus) | |
332 | (signal 'wrong-type-argument (list 'keywordp bus))) | |
333 | (or (stringp service) | |
334 | (signal 'wrong-type-argument (list 'stringp service))) | |
335 | (or (stringp path) | |
336 | (signal 'wrong-type-argument (list 'stringp path))) | |
337 | (or (stringp interface) | |
338 | (signal 'wrong-type-argument (list 'stringp interface))) | |
339 | (or (stringp method) | |
340 | (signal 'wrong-type-argument (list 'stringp method))) | |
341 | (or (null handler) (functionp handler) | |
342 | (signal 'wrong-type-argument (list 'functionp handler))) | |
343 | ||
344 | (apply 'dbus-message-internal dbus-message-type-method-call | |
345 | bus service path interface method handler args)) | |
346 | ||
347 | (defun dbus-send-signal (bus service path interface signal &rest args) | |
348 | "Send signal SIGNAL on the D-Bus BUS. | |
349 | ||
350 | BUS is either a Lisp symbol, `:system' or `:session', or a string | |
351 | denoting the bus address. The signal is sent from the D-Bus object | |
352 | Emacs is registered at BUS. | |
353 | ||
354 | SERVICE is the D-Bus name SIGNAL is sent to. It can be either a known | |
355 | name or a unique name. If SERVICE is nil, the signal is sent as | |
356 | broadcast message. PATH is the D-Bus object path SIGNAL is sent from. | |
357 | INTERFACE is an interface available at PATH. It must provide signal | |
358 | SIGNAL. | |
359 | ||
360 | All other arguments ARGS are passed to SIGNAL as arguments. They are | |
361 | converted into D-Bus types via the following rules: | |
362 | ||
363 | t and nil => DBUS_TYPE_BOOLEAN | |
364 | number => DBUS_TYPE_UINT32 | |
365 | integer => DBUS_TYPE_INT32 | |
366 | float => DBUS_TYPE_DOUBLE | |
367 | string => DBUS_TYPE_STRING | |
368 | list => DBUS_TYPE_ARRAY | |
369 | ||
370 | All arguments can be preceded by a type symbol. For details about | |
371 | type symbols, see Info node `(dbus)Type Conversion'. | |
372 | ||
373 | Example: | |
374 | ||
375 | \(dbus-send-signal | |
376 | :session nil \"/org/gnu/Emacs\" \"org.gnu.Emacs.FileManager\" | |
377 | \"FileModified\" \"/home/albinus/.emacs\")" | |
378 | ||
379 | (or (memq bus '(:system :session)) (stringp bus) | |
380 | (signal 'wrong-type-argument (list 'keywordp bus))) | |
381 | (or (null service) (stringp service) | |
382 | (signal 'wrong-type-argument (list 'stringp service))) | |
383 | (or (stringp path) | |
384 | (signal 'wrong-type-argument (list 'stringp path))) | |
385 | (or (stringp interface) | |
386 | (signal 'wrong-type-argument (list 'stringp interface))) | |
387 | (or (stringp signal) | |
388 | (signal 'wrong-type-argument (list 'stringp signal))) | |
389 | ||
390 | (apply 'dbus-message-internal dbus-message-type-signal | |
391 | bus service path interface signal args)) | |
392 | ||
393 | (defun dbus-method-return-internal (bus service serial &rest args) | |
394 | "Return for message SERIAL on the D-Bus BUS. | |
395 | This is an internal function, it shall not be used outside dbus.el." | |
396 | ||
397 | (or (memq bus '(:system :session)) (stringp bus) | |
398 | (signal 'wrong-type-argument (list 'keywordp bus))) | |
399 | (or (stringp service) | |
400 | (signal 'wrong-type-argument (list 'stringp service))) | |
401 | (or (natnump serial) | |
402 | (signal 'wrong-type-argument (list 'natnump serial))) | |
403 | ||
404 | (apply 'dbus-message-internal dbus-message-type-method-return | |
405 | bus service serial args)) | |
406 | ||
407 | (defun dbus-method-error-internal (bus service serial &rest args) | |
408 | "Return error message for message SERIAL on the D-Bus BUS. | |
409 | This is an internal function, it shall not be used outside dbus.el." | |
410 | ||
411 | (or (memq bus '(:system :session)) (stringp bus) | |
412 | (signal 'wrong-type-argument (list 'keywordp bus))) | |
413 | (or (stringp service) | |
414 | (signal 'wrong-type-argument (list 'stringp service))) | |
415 | (or (natnump serial) | |
416 | (signal 'wrong-type-argument (list 'natnump serial))) | |
417 | ||
418 | (apply 'dbus-message-internal dbus-message-type-error | |
419 | bus service serial args)) | |
420 | ||
421 | \f | |
422 | ;;; Hash table of registered functions. | |
98c38bfc | 423 | |
ef6ce14c | 424 | (defun dbus-list-hash-table () |
e49d337b | 425 | "Returns all registered member registrations to D-Bus. |
ef6ce14c | 426 | The return value is a list, with elements of kind (KEY . VALUE). |
b172ed20 | 427 | See `dbus-registered-objects-table' for a description of the |
ef6ce14c MA |
428 | hash table." |
429 | (let (result) | |
430 | (maphash | |
4f91a816 | 431 | (lambda (key value) (add-to-list 'result (cons key value) 'append)) |
b172ed20 | 432 | dbus-registered-objects-table) |
ef6ce14c MA |
433 | result)) |
434 | ||
dcbf5805 MA |
435 | (defun dbus-setenv (bus variable value) |
436 | "Set the value of the BUS environment variable named VARIABLE to VALUE. | |
b172ed20 | 437 | |
dcbf5805 MA |
438 | BUS is either a Lisp symbol, `:system' or `:session', or a string |
439 | denoting the bus address. Both VARIABLE and VALUE should be strings. | |
246a286b | 440 | |
dcbf5805 MA |
441 | Normally, services inherit the environment of the BUS daemon. This |
442 | function adds to or modifies that environment when activating services. | |
b172ed20 | 443 | |
dcbf5805 MA |
444 | Some bus instances, such as `:system', may disable setting the environment." |
445 | (dbus-call-method | |
446 | bus dbus-service-dbus dbus-path-dbus | |
447 | dbus-interface-dbus "UpdateActivationEnvironment" | |
448 | `(:array (:dict-entry ,variable ,value)))) | |
449 | ||
450 | (defun dbus-register-service (bus service &rest flags) | |
451 | "Register known name SERVICE on the D-Bus BUS. | |
452 | ||
453 | BUS is either a Lisp symbol, `:system' or `:session', or a string | |
454 | denoting the bus address. | |
455 | ||
456 | SERVICE is the D-Bus service name that should be registered. It must | |
457 | be a known name. | |
458 | ||
459 | FLAGS are keywords, which control how the service name is registered. | |
460 | The following keywords are recognized: | |
461 | ||
462 | `:allow-replacement': Allow another service to become the primary | |
463 | owner if requested. | |
464 | ||
465 | `:replace-existing': Request to replace the current primary owner. | |
466 | ||
467 | `:do-not-queue': If we can not become the primary owner do not place | |
468 | us in the queue. | |
469 | ||
470 | The function returns a keyword, indicating the result of the | |
471 | operation. One of the following keywords is returned: | |
472 | ||
473 | `:primary-owner': Service has become the primary owner of the | |
474 | requested name. | |
475 | ||
476 | `:in-queue': Service could not become the primary owner and has been | |
477 | placed in the queue. | |
478 | ||
479 | `:exists': Service is already in the queue. | |
480 | ||
481 | `:already-owner': Service is already the primary owner." | |
482 | ||
483 | ;; Add ObjectManager handler. | |
484 | (dbus-register-method | |
485 | bus service nil dbus-interface-objectmanager "GetManagedObjects" | |
486 | 'dbus-managed-objects-handler 'dont-register) | |
487 | ||
488 | (let ((arg 0) | |
489 | reply) | |
490 | (dolist (flag flags) | |
491 | (setq arg | |
492 | (+ arg | |
493 | (case flag | |
494 | (:allow-replacement 1) | |
495 | (:replace-existing 2) | |
496 | (:do-not-queue 4) | |
497 | (t (signal 'wrong-type-argument (list flag))))))) | |
498 | (setq reply (dbus-call-method | |
499 | bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus | |
500 | "RequestName" service arg)) | |
501 | (case reply | |
502 | (1 :primary-owner) | |
503 | (2 :in-queue) | |
504 | (3 :exists) | |
505 | (4 :already-owner) | |
506 | (t (signal 'dbus-error (list "Could not register service" service)))))) | |
246a286b | 507 | |
c0a39702 MA |
508 | (defun dbus-unregister-service (bus service) |
509 | "Unregister all objects related to SERVICE from D-Bus BUS. | |
e73f184c | 510 | BUS is either a Lisp symbol, `:system' or `:session', or a string |
5c0b4070 MA |
511 | denoting the bus address. SERVICE must be a known service name. |
512 | ||
513 | The function returns a keyword, indicating the result of the | |
514 | operation. One of the following keywords is returned: | |
515 | ||
516 | `:released': Service has become the primary owner of the name. | |
517 | ||
518 | `:non-existent': Service name does not exist on this bus. | |
519 | ||
520 | `:not-owner': We are neither the primary owner nor waiting in the | |
521 | queue of this service." | |
522 | ||
c0a39702 MA |
523 | (maphash |
524 | (lambda (key value) | |
525 | (dolist (elt value) | |
526 | (ignore-errors | |
dcbf5805 | 527 | (when (and (equal bus (cadr key)) (string-equal service (cadr elt))) |
c0a39702 MA |
528 | (unless |
529 | (puthash key (delete elt value) dbus-registered-objects-table) | |
530 | (remhash key dbus-registered-objects-table)))))) | |
531 | dbus-registered-objects-table) | |
0a203b61 MA |
532 | (let ((reply (dbus-call-method |
533 | bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus | |
534 | "ReleaseName" service))) | |
535 | (case reply | |
536 | (1 :released) | |
537 | (2 :non-existent) | |
538 | (3 :not-owner) | |
5c0b4070 | 539 | (t (signal 'dbus-error (list "Could not unregister service" service)))))) |
c0a39702 | 540 | |
dcbf5805 MA |
541 | (defun dbus-register-signal |
542 | (bus service path interface signal handler &rest args) | |
543 | "Register for a signal on the D-Bus BUS. | |
98c38bfc | 544 | |
dcbf5805 MA |
545 | BUS is either a Lisp symbol, `:system' or `:session', or a string |
546 | denoting the bus address. | |
98c38bfc | 547 | |
dcbf5805 MA |
548 | SERVICE is the D-Bus service name used by the sending D-Bus object. |
549 | It can be either a known name or the unique name of the D-Bus object | |
550 | sending the signal. | |
551 | ||
552 | PATH is the D-Bus object path SERVICE is registered. INTERFACE | |
553 | is an interface offered by SERVICE. It must provide SIGNAL. | |
554 | HANDLER is a Lisp function to be called when the signal is | |
555 | received. It must accept as arguments the values SIGNAL is | |
556 | sending. | |
557 | ||
558 | SERVICE, PATH, INTERFACE and SIGNAL can be nil. This is | |
559 | interpreted as a wildcard for the respective argument. | |
560 | ||
561 | The remaining arguments ARGS can be keywords or keyword string pairs. | |
562 | The meaning is as follows: | |
563 | ||
564 | `:argN' STRING: | |
565 | `:pathN' STRING: This stands for the Nth argument of the | |
566 | signal. `:pathN' arguments can be used for object path wildcard | |
0ba2624f | 567 | matches as specified by D-Bus, while an `:argN' argument |
dcbf5805 MA |
568 | requires an exact match. |
569 | ||
570 | `:arg-namespace' STRING: Register for the signals, which first | |
571 | argument defines the service or interface namespace STRING. | |
572 | ||
573 | `:path-namespace' STRING: Register for the object path namespace | |
574 | STRING. All signals sent from an object path, which has STRING as | |
575 | the preceding string, are matched. This requires PATH to be nil. | |
576 | ||
577 | `:eavesdrop': Register for unicast signals which are not directed | |
578 | to the D-Bus object Emacs is registered at D-Bus BUS, if the | |
579 | security policy of BUS allows this. | |
580 | ||
581 | Example: | |
582 | ||
583 | \(defun my-signal-handler (device) | |
584 | (message \"Device %s added\" device)) | |
585 | ||
586 | \(dbus-register-signal | |
587 | :system \"org.freedesktop.Hal\" \"/org/freedesktop/Hal/Manager\" | |
588 | \"org.freedesktop.Hal.Manager\" \"DeviceAdded\" 'my-signal-handler) | |
589 | ||
590 | => \(\(:signal :system \"org.freedesktop.Hal.Manager\" \"DeviceAdded\") | |
591 | \(\"org.freedesktop.Hal\" \"/org/freedesktop/Hal/Manager\" my-signal-handler)) | |
592 | ||
593 | `dbus-register-signal' returns an object, which can be used in | |
594 | `dbus-unregister-object' for removing the registration." | |
595 | ||
596 | (let ((counter 0) | |
597 | (rule "type='signal'") | |
598 | uname key key1 value) | |
599 | ||
600 | ;; Retrieve unique name of service. If service is a known name, | |
601 | ;; we will register for the corresponding unique name, if any. | |
602 | ;; Signals are sent always with the unique name as sender. Note: | |
603 | ;; the unique name of `dbus-service-dbus' is that string itself. | |
604 | (if (and (stringp service) | |
605 | (not (zerop (length service))) | |
606 | (not (string-equal service dbus-service-dbus)) | |
607 | (not (string-match "^:" service))) | |
608 | (setq uname (dbus-get-name-owner bus service)) | |
609 | (setq uname service)) | |
610 | ||
611 | (setq rule (concat rule | |
612 | (when uname (format ",sender='%s'" uname)) | |
613 | (when interface (format ",interface='%s'" interface)) | |
614 | (when signal (format ",member='%s'" signal)) | |
615 | (when path (format ",path='%s'" path)))) | |
616 | ||
617 | ;; Add arguments to the rule. | |
618 | (if (or (stringp (car args)) (null (car args))) | |
619 | ;; As backward compatibility option, we allow just strings. | |
620 | (dolist (arg args) | |
621 | (if (stringp arg) | |
622 | (setq rule (concat rule (format ",arg%d='%s'" counter arg))) | |
623 | (if arg (signal 'wrong-type-argument (list "Wrong argument" arg)))) | |
624 | (setq counter (1+ counter))) | |
625 | ||
626 | ;; Parse keywords. | |
627 | (while args | |
628 | (setq | |
629 | key (car args) | |
630 | rule (concat | |
631 | rule | |
632 | (cond | |
633 | ;; `:arg0' .. `:arg63', `:path0' .. `:path63'. | |
634 | ((and (keywordp key) | |
635 | (string-match | |
636 | "^:\\(arg\\|path\\)\\([[:digit:]]+\\)$" | |
637 | (symbol-name key))) | |
638 | (setq counter (match-string 2 (symbol-name key)) | |
639 | args (cdr args) | |
640 | value (car args)) | |
641 | (unless (and (<= counter 63) (stringp value)) | |
642 | (signal 'wrong-type-argument | |
643 | (list "Wrong argument" key value))) | |
644 | (format | |
645 | ",arg%s%s='%s'" | |
646 | counter | |
647 | (if (string-equal (match-string 1 (symbol-name key)) "path") | |
648 | "path" "") | |
649 | value)) | |
650 | ;; `:arg-namespace', `:path-namespace'. | |
651 | ((and (keywordp key) | |
652 | (string-match | |
653 | "^:\\(arg\\|path\\)-namespace$" (symbol-name key))) | |
654 | (setq args (cdr args) | |
655 | value (car args)) | |
656 | (unless (stringp value) | |
657 | (signal 'wrong-type-argument | |
658 | (list "Wrong argument" key value))) | |
659 | (format | |
660 | ",%s='%s'" | |
661 | (if (string-equal (match-string 1 (symbol-name key)) "path") | |
662 | "path_namespace" "arg0namespace") | |
663 | value)) | |
664 | ;; `:eavesdrop'. | |
665 | ((eq key :eavesdrop) | |
666 | ",eavesdrop='true'") | |
667 | (t (signal 'wrong-type-argument (list "Wrong argument" key))))) | |
668 | args (cdr args)))) | |
669 | ||
670 | ;; Add the rule to the bus. | |
671 | (condition-case err | |
672 | (dbus-call-method | |
673 | bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus | |
674 | "AddMatch" rule) | |
675 | (dbus-error | |
676 | (if (not (string-match "eavesdrop" rule)) | |
677 | (signal (car err) (cdr err)) | |
678 | ;; The D-Bus spec says we shall fall back to a rule without eavesdrop. | |
679 | (when dbus-debug (message "Removing eavesdrop from rule %s" rule)) | |
680 | (setq rule (replace-regexp-in-string ",eavesdrop='true'" "" rule)) | |
681 | (dbus-call-method | |
682 | bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus | |
683 | "AddMatch" rule)))) | |
98c38bfc | 684 | |
dcbf5805 | 685 | (when dbus-debug (message "Matching rule \"%s\" created" rule)) |
98c38bfc | 686 | |
dcbf5805 MA |
687 | ;; Create a hash table entry. |
688 | (setq key (list :signal bus interface signal) | |
689 | key1 (list uname service path handler rule) | |
690 | value (gethash key dbus-registered-objects-table)) | |
691 | (unless (member key1 value) | |
692 | (puthash key (cons key1 value) dbus-registered-objects-table)) | |
98c38bfc | 693 | |
dcbf5805 MA |
694 | ;; Return the object. |
695 | (list key (list service path handler)))) | |
98c38bfc | 696 | |
dcbf5805 MA |
697 | (defun dbus-register-method |
698 | (bus service path interface method handler &optional dont-register-service) | |
699 | "Register for method METHOD on the D-Bus BUS. | |
700 | ||
701 | BUS is either a Lisp symbol, `:system' or `:session', or a string | |
702 | denoting the bus address. | |
703 | ||
704 | SERVICE is the D-Bus service name of the D-Bus object METHOD is | |
705 | registered for. It must be a known name (See discussion of | |
706 | DONT-REGISTER-SERVICE below). | |
707 | ||
708 | PATH is the D-Bus object path SERVICE is registered (See discussion of | |
709 | DONT-REGISTER-SERVICE below). INTERFACE is the interface offered by | |
710 | SERVICE. It must provide METHOD. | |
711 | ||
712 | HANDLER is a Lisp function to be called when a method call is | |
713 | received. It must accept the input arguments of METHOD. The return | |
714 | value of HANDLER is used for composing the returning D-Bus message. | |
715 | In case HANDLER shall return a reply message with an empty argument | |
716 | list, HANDLER must return the symbol `:ignore'. | |
717 | ||
718 | When DONT-REGISTER-SERVICE is non-nil, the known name SERVICE is not | |
719 | registered. This means that other D-Bus clients have no way of | |
720 | noticing the newly registered method. When interfaces are constructed | |
721 | incrementally by adding single methods or properties at a time, | |
722 | DONT-REGISTER-SERVICE can be used to prevent other clients from | |
723 | discovering the still incomplete interface." | |
724 | ||
725 | ;; Register SERVICE. | |
726 | (unless (or dont-register-service | |
727 | (member service (dbus-list-names bus))) | |
728 | (dbus-register-service bus service)) | |
729 | ||
730 | ;; Create a hash table entry. We use nil for the unique name, | |
731 | ;; because the method might be called from anybody. | |
732 | (let* ((key (list :method bus interface method)) | |
733 | (key1 (list nil service path handler)) | |
734 | (value (gethash key dbus-registered-objects-table))) | |
735 | ||
736 | (unless (member key1 value) | |
737 | (puthash key (cons key1 value) dbus-registered-objects-table)) | |
738 | ||
739 | ;; Return the object. | |
740 | (list key (list service path handler)))) | |
741 | ||
742 | (defun dbus-unregister-object (object) | |
743 | "Unregister OBJECT from D-Bus. | |
744 | OBJECT must be the result of a preceding `dbus-register-method', | |
745 | `dbus-register-property' or `dbus-register-signal' call. It | |
746 | returns `t' if OBJECT has been unregistered, `nil' otherwise. | |
747 | ||
748 | When OBJECT identifies the last method or property, which is | |
749 | registered for the respective service, Emacs releases its | |
750 | association to the service from D-Bus." | |
751 | ;; Check parameter. | |
752 | (unless (and (consp object) (not (null (car object))) (consp (cdr object))) | |
753 | (signal 'wrong-type-argument (list 'D-Bus object))) | |
754 | ||
755 | ;; Find the corresponding entry in the hash table. | |
756 | (let* ((key (car object)) | |
757 | (type (car key)) | |
758 | (bus (cadr key)) | |
759 | (value (cadr object)) | |
760 | (service (car value)) | |
761 | (entry (gethash key dbus-registered-objects-table)) | |
762 | ret) | |
763 | ;; key has the structure (TYPE BUS INTERFACE MEMBER). | |
764 | ;; value has the structure (SERVICE PATH [HANDLER]). | |
765 | ;; entry has the structure ((UNAME SERVICE PATH MEMBER [RULE]) ...). | |
766 | ;; MEMBER is either a string (the handler), or a cons cell (a | |
767 | ;; property value). UNAME and property values are not taken into | |
768 | ;; account for comparison. | |
769 | ||
770 | ;; Loop over the registered functions. | |
771 | (dolist (elt entry) | |
772 | (when (equal | |
773 | value | |
774 | (butlast (cdr elt) (- (length (cdr elt)) (length value)))) | |
775 | (setq ret t) | |
776 | ;; Compute new hash value. If it is empty, remove it from the | |
777 | ;; hash table. | |
778 | (unless (puthash key (delete elt entry) dbus-registered-objects-table) | |
779 | (remhash key dbus-registered-objects-table)) | |
780 | ;; Remove match rule of signals. | |
781 | (when (eq type :signal) | |
782 | (dbus-call-method | |
783 | bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus | |
784 | "RemoveMatch" (nth 4 elt))))) | |
785 | ||
786 | ;; Check, whether there is still a registered function or property | |
787 | ;; for the given service. If not, unregister the service from the | |
788 | ;; bus. | |
789 | (when (and service (memq type '(:method :property)) | |
790 | (not (catch :found | |
791 | (progn | |
792 | (maphash | |
793 | (lambda (k v) | |
794 | (dolist (e v) | |
795 | (ignore-errors | |
796 | (and | |
797 | ;; Bus. | |
798 | (equal bus (cadr k)) | |
799 | ;; Service. | |
800 | (string-equal service (cadr e)) | |
801 | ;; Non-empty object path. | |
802 | (caddr e) | |
803 | (throw :found t))))) | |
804 | dbus-registered-objects-table) | |
805 | nil)))) | |
806 | (dbus-unregister-service bus service)) | |
807 | ;; Return. | |
808 | ret)) | |
ef6ce14c | 809 | |
5363d8ea | 810 | \f |
82697a45 MA |
811 | ;;; D-Bus type conversion. |
812 | ||
813 | (defun dbus-string-to-byte-array (string) | |
814 | "Transforms STRING to list (:array :byte c1 :byte c2 ...). | |
815 | STRING shall be UTF8 coded." | |
d665fff0 MA |
816 | (if (zerop (length string)) |
817 | '(:array :signature "y") | |
818 | (let (result) | |
819 | (dolist (elt (string-to-list string) (append '(:array) result)) | |
820 | (setq result (append result (list :byte elt))))))) | |
82697a45 MA |
821 | |
822 | (defun dbus-byte-array-to-string (byte-array) | |
823 | "Transforms BYTE-ARRAY into UTF8 coded string. | |
824 | BYTE-ARRAY must be a list of structure (c1 c2 ...)." | |
825 | (apply 'string byte-array)) | |
826 | ||
827 | (defun dbus-escape-as-identifier (string) | |
828 | "Escape an arbitrary STRING so it follows the rules for a C identifier. | |
829 | The escaped string can be used as object path component, interface element | |
830 | component, bus name component or member name in D-Bus. | |
831 | ||
832 | The escaping consists of replacing all non-alphanumerics, and the | |
833 | first character if it's a digit, with an underscore and two | |
834 | lower-case hex digits: | |
835 | ||
836 | \"0123abc_xyz\\x01\\xff\" -> \"_30123abc_5fxyz_01_ff\" | |
837 | ||
838 | i.e. similar to URI encoding, but with \"_\" taking the role of \"%\", | |
839 | and a smaller allowed set. As a special case, \"\" is escaped to | |
840 | \"_\". | |
841 | ||
842 | Returns the escaped string. Algorithm taken from | |
843 | telepathy-glib's `tp-escape-as-identifier'." | |
844 | (if (zerop (length string)) | |
845 | "_" | |
846 | (replace-regexp-in-string | |
847 | "^[0-9]\\|[^A-Za-z0-9]" | |
848 | (lambda (x) (format "_%2x" (aref x 0))) | |
849 | string))) | |
850 | ||
851 | (defun dbus-unescape-from-identifier (string) | |
852 | "Retrieve the original string from the encoded STRING. | |
853 | STRING must have been coded with `dbus-escape-as-identifier'" | |
854 | (if (string-equal string "_") | |
855 | "" | |
856 | (replace-regexp-in-string | |
857 | "_.." | |
858 | (lambda (x) (format "%c" (string-to-number (substring x 1) 16))) | |
859 | string))) | |
860 | ||
861 | \f | |
5363d8ea MA |
862 | ;;; D-Bus events. |
863 | ||
3a993e3d MA |
864 | (defun dbus-check-event (event) |
865 | "Checks whether EVENT is a well formed D-Bus event. | |
866 | EVENT is a list which starts with symbol `dbus-event': | |
867 | ||
98c38bfc | 868 | (dbus-event BUS TYPE SERIAL SERVICE PATH INTERFACE MEMBER HANDLER &rest ARGS) |
3a993e3d | 869 | |
e49d337b | 870 | BUS identifies the D-Bus the message is coming from. It is |
e73f184c MA |
871 | either a Lisp symbol, `:system' or `:session', or a string |
872 | denoting the bus address. TYPE is the D-Bus message type which | |
873 | has caused the event, SERIAL is the serial number of the received | |
874 | D-Bus message. SERVICE and PATH are the unique name and the | |
875 | object path of the D-Bus object emitting the message. INTERFACE | |
876 | and MEMBER denote the message which has been sent. HANDLER is | |
877 | the function which has been registered for this message. ARGS | |
878 | are the arguments passed to HANDLER, when it is called during | |
879 | event handling in `dbus-handle-event'. | |
3a993e3d MA |
880 | |
881 | This function raises a `dbus-error' signal in case the event is | |
882 | not well formed." | |
883 | (when dbus-debug (message "DBus-Event %s" event)) | |
884 | (unless (and (listp event) | |
885 | (eq (car event) 'dbus-event) | |
5363d8ea | 886 | ;; Bus symbol. |
e73f184c MA |
887 | (or (symbolp (nth 1 event)) |
888 | (stringp (nth 1 event))) | |
98c38bfc MA |
889 | ;; Type. |
890 | (and (natnump (nth 2 event)) | |
891 | (< dbus-message-type-invalid (nth 2 event))) | |
e49d337b | 892 | ;; Serial. |
98c38bfc | 893 | (natnump (nth 3 event)) |
5363d8ea | 894 | ;; Service. |
98c38bfc | 895 | (or (= dbus-message-type-method-return (nth 2 event)) |
ba0b66b0 | 896 | (= dbus-message-type-error (nth 2 event)) |
98c38bfc | 897 | (stringp (nth 4 event))) |
e49d337b | 898 | ;; Object path. |
98c38bfc | 899 | (or (= dbus-message-type-method-return (nth 2 event)) |
ba0b66b0 | 900 | (= dbus-message-type-error (nth 2 event)) |
98c38bfc | 901 | (stringp (nth 5 event))) |
e49d337b | 902 | ;; Interface. |
98c38bfc | 903 | (or (= dbus-message-type-method-return (nth 2 event)) |
ba0b66b0 | 904 | (= dbus-message-type-error (nth 2 event)) |
98c38bfc | 905 | (stringp (nth 6 event))) |
e49d337b | 906 | ;; Member. |
98c38bfc | 907 | (or (= dbus-message-type-method-return (nth 2 event)) |
ba0b66b0 | 908 | (= dbus-message-type-error (nth 2 event)) |
98c38bfc | 909 | (stringp (nth 7 event))) |
ef6ce14c | 910 | ;; Handler. |
98c38bfc | 911 | (functionp (nth 8 event))) |
3a993e3d MA |
912 | (signal 'dbus-error (list "Not a valid D-Bus event" event)))) |
913 | ||
914 | ;;;###autoload | |
915 | (defun dbus-handle-event (event) | |
916 | "Handle events from the D-Bus. | |
5363d8ea | 917 | EVENT is a D-Bus event, see `dbus-check-event'. HANDLER, being |
98c38bfc | 918 | part of the event, is called with arguments ARGS. |
35b148ee | 919 | If the HANDLER returns a `dbus-error', it is propagated as return message." |
3a993e3d | 920 | (interactive "e") |
98c38bfc MA |
921 | (condition-case err |
922 | (let (result) | |
ba0b66b0 | 923 | ;; We ignore not well-formed events. |
98c38bfc | 924 | (dbus-check-event event) |
ba0b66b0 MA |
925 | ;; Error messages must be propagated. |
926 | (when (= dbus-message-type-error (nth 2 event)) | |
927 | (signal 'dbus-error (nthcdr 9 event))) | |
928 | ;; Apply the handler. | |
98c38bfc MA |
929 | (setq result (apply (nth 8 event) (nthcdr 9 event))) |
930 | ;; Return a message when it is a message call. | |
931 | (when (= dbus-message-type-method-call (nth 2 event)) | |
932 | (dbus-ignore-errors | |
3dec5c36 MA |
933 | (if (eq result :ignore) |
934 | (dbus-method-return-internal | |
dcbf5805 | 935 | (nth 1 event) (nth 4 event) (nth 3 event)) |
3dec5c36 | 936 | (apply 'dbus-method-return-internal |
dcbf5805 | 937 | (nth 1 event) (nth 4 event) (nth 3 event) |
3dec5c36 | 938 | (if (consp result) result (list result))))))) |
98c38bfc MA |
939 | ;; Error handling. |
940 | (dbus-error | |
941 | ;; Return an error message when it is a message call. | |
942 | (when (= dbus-message-type-method-call (nth 2 event)) | |
943 | (dbus-ignore-errors | |
944 | (dbus-method-error-internal | |
dcbf5805 | 945 | (nth 1 event) (nth 4 event) (nth 3 event) (cadr err)))) |
ba0b66b0 | 946 | ;; Propagate D-Bus error messages. |
f213fc09 | 947 | (run-hook-with-args 'dbus-event-error-hooks event err) |
ba0b66b0 MA |
948 | (when (or dbus-debug (= dbus-message-type-error (nth 2 event))) |
949 | (signal (car err) (cdr err)))))) | |
3a993e3d MA |
950 | |
951 | (defun dbus-event-bus-name (event) | |
952 | "Return the bus name the event is coming from. | |
e73f184c MA |
953 | The result is either a Lisp symbol, `:system' or `:session', or a |
954 | string denoting the bus address. EVENT is a D-Bus event, see | |
955 | `dbus-check-event'. This function raises a `dbus-error' signal | |
956 | in case the event is not well formed." | |
3a993e3d | 957 | (dbus-check-event event) |
ef6ce14c | 958 | (nth 1 event)) |
3a993e3d | 959 | |
98c38bfc MA |
960 | (defun dbus-event-message-type (event) |
961 | "Return the message type of the corresponding D-Bus message. | |
962 | The result is a number. EVENT is a D-Bus event, see | |
963 | `dbus-check-event'. This function raises a `dbus-error' signal | |
964 | in case the event is not well formed." | |
965 | (dbus-check-event event) | |
966 | (nth 2 event)) | |
967 | ||
e49d337b MA |
968 | (defun dbus-event-serial-number (event) |
969 | "Return the serial number of the corresponding D-Bus message. | |
98c38bfc MA |
970 | The result is a number. The serial number is needed for |
971 | generating a reply message. EVENT is a D-Bus event, see | |
972 | `dbus-check-event'. This function raises a `dbus-error' signal | |
973 | in case the event is not well formed." | |
e49d337b | 974 | (dbus-check-event event) |
98c38bfc | 975 | (nth 3 event)) |
e49d337b | 976 | |
3a993e3d | 977 | (defun dbus-event-service-name (event) |
5363d8ea | 978 | "Return the name of the D-Bus object the event is coming from. |
3a993e3d MA |
979 | The result is a string. EVENT is a D-Bus event, see `dbus-check-event'. |
980 | This function raises a `dbus-error' signal in case the event is | |
981 | not well formed." | |
982 | (dbus-check-event event) | |
98c38bfc | 983 | (nth 4 event)) |
3a993e3d MA |
984 | |
985 | (defun dbus-event-path-name (event) | |
986 | "Return the object path of the D-Bus object the event is coming from. | |
987 | The result is a string. EVENT is a D-Bus event, see `dbus-check-event'. | |
988 | This function raises a `dbus-error' signal in case the event is | |
989 | not well formed." | |
990 | (dbus-check-event event) | |
98c38bfc | 991 | (nth 5 event)) |
3a993e3d MA |
992 | |
993 | (defun dbus-event-interface-name (event) | |
994 | "Return the interface name of the D-Bus object the event is coming from. | |
995 | The result is a string. EVENT is a D-Bus event, see `dbus-check-event'. | |
996 | This function raises a `dbus-error' signal in case the event is | |
997 | not well formed." | |
998 | (dbus-check-event event) | |
98c38bfc | 999 | (nth 6 event)) |
3a993e3d MA |
1000 | |
1001 | (defun dbus-event-member-name (event) | |
1002 | "Return the member name the event is coming from. | |
58179cce | 1003 | It is either a signal name or a method name. The result is a |
3a993e3d MA |
1004 | string. EVENT is a D-Bus event, see `dbus-check-event'. This |
1005 | function raises a `dbus-error' signal in case the event is not | |
1006 | well formed." | |
1007 | (dbus-check-event event) | |
98c38bfc | 1008 | (nth 7 event)) |
5363d8ea MA |
1009 | |
1010 | \f | |
1011 | ;;; D-Bus registered names. | |
3a993e3d | 1012 | |
07e52e08 | 1013 | (defun dbus-list-activatable-names (&optional bus) |
3a993e3d | 1014 | "Return the D-Bus service names which can be activated as list. |
07e52e08 MA |
1015 | If BUS is left nil, `:system' is assumed. The result is a list |
1016 | of strings, which is `nil' when there are no activatable service | |
1017 | names at all." | |
246a286b MA |
1018 | (dbus-ignore-errors |
1019 | (dbus-call-method | |
07e52e08 | 1020 | (or bus :system) dbus-service-dbus |
246a286b | 1021 | dbus-path-dbus dbus-interface-dbus "ListActivatableNames"))) |
3a993e3d MA |
1022 | |
1023 | (defun dbus-list-names (bus) | |
1024 | "Return the service names registered at D-Bus BUS. | |
f636d3ca MA |
1025 | The result is a list of strings, which is `nil' when there are no |
1026 | registered service names at all. Well known names are strings | |
1027 | like \"org.freedesktop.DBus\". Names starting with \":\" are | |
1028 | unique names for services." | |
246a286b MA |
1029 | (dbus-ignore-errors |
1030 | (dbus-call-method | |
1031 | bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus "ListNames"))) | |
3a993e3d MA |
1032 | |
1033 | (defun dbus-list-known-names (bus) | |
1034 | "Retrieve all services which correspond to a known name in BUS. | |
1035 | A service has a known name if it doesn't start with \":\"." | |
1036 | (let (result) | |
1037 | (dolist (name (dbus-list-names bus) result) | |
1038 | (unless (string-equal ":" (substring name 0 1)) | |
1039 | (add-to-list 'result name 'append))))) | |
1040 | ||
1041 | (defun dbus-list-queued-owners (bus service) | |
f636d3ca MA |
1042 | "Return the unique names registered at D-Bus BUS and queued for SERVICE. |
1043 | The result is a list of strings, or `nil' when there are no | |
1044 | queued name owners service names at all." | |
246a286b MA |
1045 | (dbus-ignore-errors |
1046 | (dbus-call-method | |
1047 | bus dbus-service-dbus dbus-path-dbus | |
1048 | dbus-interface-dbus "ListQueuedOwners" service))) | |
3a993e3d MA |
1049 | |
1050 | (defun dbus-get-name-owner (bus service) | |
1051 | "Return the name owner of SERVICE registered at D-Bus BUS. | |
f636d3ca | 1052 | The result is either a string, or `nil' if there is no name owner." |
246a286b MA |
1053 | (dbus-ignore-errors |
1054 | (dbus-call-method | |
1055 | bus dbus-service-dbus dbus-path-dbus | |
1056 | dbus-interface-dbus "GetNameOwner" service))) | |
3a993e3d | 1057 | |
93fb0645 MA |
1058 | (defun dbus-ping (bus service &optional timeout) |
1059 | "Check whether SERVICE is registered for D-Bus BUS. | |
1060 | TIMEOUT, a nonnegative integer, specifies the maximum number of | |
1061 | milliseconds `dbus-ping' must return. The default value is 25,000. | |
1062 | ||
1063 | Note, that this autoloads SERVICE if it is not running yet. If | |
1064 | it shall be checked whether SERVICE is already running, one shall | |
1065 | apply | |
1066 | ||
1067 | \(member service \(dbus-list-known-names bus))" | |
4ba11bcb MA |
1068 | ;; "Ping" raises a D-Bus error if SERVICE does not exist. |
1069 | ;; Otherwise, it returns silently with `nil'. | |
1070 | (condition-case nil | |
1071 | (not | |
93fb0645 MA |
1072 | (if (natnump timeout) |
1073 | (dbus-call-method | |
1074 | bus service dbus-path-dbus dbus-interface-peer | |
1075 | "Ping" :timeout timeout) | |
1076 | (dbus-call-method | |
1077 | bus service dbus-path-dbus dbus-interface-peer "Ping"))) | |
4ba11bcb MA |
1078 | (dbus-error nil))) |
1079 | ||
f636d3ca MA |
1080 | \f |
1081 | ;;; D-Bus introspection. | |
3a993e3d | 1082 | |
f636d3ca | 1083 | (defun dbus-introspect (bus service path) |
35b148ee | 1084 | "Return all interfaces and sub-nodes of SERVICE, |
f636d3ca MA |
1085 | registered at object path PATH at bus BUS. |
1086 | ||
e73f184c MA |
1087 | BUS is either a Lisp symbol, `:system' or `:session', or a string |
1088 | denoting the bus address. SERVICE must be a known service name, | |
1089 | and PATH must be a valid object path. The last two parameters | |
1090 | are strings. The result, the introspection data, is a string in | |
1091 | XML format." | |
736215fd MA |
1092 | ;; We don't want to raise errors. `dbus-call-method-non-blocking' |
1093 | ;; is used, because the handler can be registered in our Emacs | |
dcbf5805 | 1094 | ;; instance; caller and callee would block each other. |
246a286b | 1095 | (dbus-ignore-errors |
dcbf5805 MA |
1096 | (dbus-call-method |
1097 | bus service path dbus-interface-introspectable "Introspect" | |
1098 | :timeout 1000))) | |
3a993e3d | 1099 | |
f636d3ca MA |
1100 | (defun dbus-introspect-xml (bus service path) |
1101 | "Return the introspection data of SERVICE in D-Bus BUS at object path PATH. | |
1102 | The data are a parsed list. The root object is a \"node\", | |
1103 | representing the object path PATH. The root object can contain | |
1104 | \"interface\" and further \"node\" objects." | |
1105 | ;; We don't want to raise errors. | |
1106 | (xml-node-name | |
1107 | (ignore-errors | |
1108 | (with-temp-buffer | |
1109 | (insert (dbus-introspect bus service path)) | |
1110 | (xml-parse-region (point-min) (point-max)))))) | |
1111 | ||
1112 | (defun dbus-introspect-get-attribute (object attribute) | |
1113 | "Return the ATTRIBUTE value of D-Bus introspection OBJECT. | |
1114 | ATTRIBUTE must be a string according to the attribute names in | |
1115 | the D-Bus specification." | |
1116 | (xml-get-attribute-or-nil object (intern attribute))) | |
1117 | ||
1118 | (defun dbus-introspect-get-node-names (bus service path) | |
1119 | "Return all node names of SERVICE in D-Bus BUS at object path PATH. | |
1120 | It returns a list of strings. The node names stand for further | |
1121 | object paths of the D-Bus service." | |
1122 | (let ((object (dbus-introspect-xml bus service path)) | |
1123 | result) | |
1124 | (dolist (elt (xml-get-children object 'node) result) | |
1125 | (add-to-list | |
1126 | 'result (dbus-introspect-get-attribute elt "name") 'append)))) | |
1127 | ||
1128 | (defun dbus-introspect-get-all-nodes (bus service path) | |
1129 | "Return all node names of SERVICE in D-Bus BUS at object path PATH. | |
1130 | It returns a list of strings, which are further object paths of SERVICE." | |
1131 | (let ((result (list path))) | |
1132 | (dolist (elt | |
1133 | (dbus-introspect-get-node-names bus service path) | |
1134 | result) | |
1135 | (setq elt (expand-file-name elt path)) | |
1136 | (setq result | |
1137 | (append result (dbus-introspect-get-all-nodes bus service elt)))))) | |
1138 | ||
1139 | (defun dbus-introspect-get-interface-names (bus service path) | |
1140 | "Return all interface names of SERVICE in D-Bus BUS at object path PATH. | |
1141 | It returns a list of strings. | |
1142 | ||
1143 | There will be always the default interface | |
1144 | \"org.freedesktop.DBus.Introspectable\". Another default | |
1145 | interface is \"org.freedesktop.DBus.Properties\". If present, | |
1146 | \"interface\" objects can also have \"property\" objects as | |
1147 | children, beside \"method\" and \"signal\" objects." | |
1148 | (let ((object (dbus-introspect-xml bus service path)) | |
1149 | result) | |
1150 | (dolist (elt (xml-get-children object 'interface) result) | |
1151 | (add-to-list | |
1152 | 'result (dbus-introspect-get-attribute elt "name") 'append)))) | |
1153 | ||
1154 | (defun dbus-introspect-get-interface (bus service path interface) | |
1155 | "Return the INTERFACE of SERVICE in D-Bus BUS at object path PATH. | |
1156 | The return value is an XML object. INTERFACE must be a string, | |
35b148ee JB |
1157 | element of the list returned by `dbus-introspect-get-interface-names'. |
1158 | The resulting \"interface\" object can contain \"method\", \"signal\", | |
f636d3ca MA |
1159 | \"property\" and \"annotation\" children." |
1160 | (let ((elt (xml-get-children | |
1161 | (dbus-introspect-xml bus service path) 'interface))) | |
1162 | (while (and elt | |
1163 | (not (string-equal | |
1164 | interface | |
1165 | (dbus-introspect-get-attribute (car elt) "name")))) | |
1166 | (setq elt (cdr elt))) | |
1167 | (car elt))) | |
1168 | ||
1169 | (defun dbus-introspect-get-method-names (bus service path interface) | |
1170 | "Return a list of strings of all method names of INTERFACE. | |
1171 | SERVICE is a service of D-Bus BUS at object path PATH." | |
1172 | (let ((object (dbus-introspect-get-interface bus service path interface)) | |
1173 | result) | |
1174 | (dolist (elt (xml-get-children object 'method) result) | |
1175 | (add-to-list | |
1176 | 'result (dbus-introspect-get-attribute elt "name") 'append)))) | |
1177 | ||
1178 | (defun dbus-introspect-get-method (bus service path interface method) | |
1179 | "Return method METHOD of interface INTERFACE as XML object. | |
1180 | It must be located at SERVICE in D-Bus BUS at object path PATH. | |
1181 | METHOD must be a string, element of the list returned by | |
1182 | `dbus-introspect-get-method-names'. The resulting \"method\" | |
1183 | object can contain \"arg\" and \"annotation\" children." | |
1184 | (let ((elt (xml-get-children | |
1185 | (dbus-introspect-get-interface bus service path interface) | |
1186 | 'method))) | |
1187 | (while (and elt | |
1188 | (not (string-equal | |
1189 | method (dbus-introspect-get-attribute (car elt) "name")))) | |
1190 | (setq elt (cdr elt))) | |
1191 | (car elt))) | |
1192 | ||
1193 | (defun dbus-introspect-get-signal-names (bus service path interface) | |
1194 | "Return a list of strings of all signal names of INTERFACE. | |
1195 | SERVICE is a service of D-Bus BUS at object path PATH." | |
1196 | (let ((object (dbus-introspect-get-interface bus service path interface)) | |
1197 | result) | |
1198 | (dolist (elt (xml-get-children object 'signal) result) | |
1199 | (add-to-list | |
1200 | 'result (dbus-introspect-get-attribute elt "name") 'append)))) | |
1201 | ||
1202 | (defun dbus-introspect-get-signal (bus service path interface signal) | |
1203 | "Return signal SIGNAL of interface INTERFACE as XML object. | |
1204 | It must be located at SERVICE in D-Bus BUS at object path PATH. | |
1205 | SIGNAL must be a string, element of the list returned by | |
1206 | `dbus-introspect-get-signal-names'. The resulting \"signal\" | |
1207 | object can contain \"arg\" and \"annotation\" children." | |
1208 | (let ((elt (xml-get-children | |
1209 | (dbus-introspect-get-interface bus service path interface) | |
1210 | 'signal))) | |
1211 | (while (and elt | |
1212 | (not (string-equal | |
1213 | signal (dbus-introspect-get-attribute (car elt) "name")))) | |
1214 | (setq elt (cdr elt))) | |
1215 | (car elt))) | |
1216 | ||
1217 | (defun dbus-introspect-get-property-names (bus service path interface) | |
1218 | "Return a list of strings of all property names of INTERFACE. | |
1219 | SERVICE is a service of D-Bus BUS at object path PATH." | |
1220 | (let ((object (dbus-introspect-get-interface bus service path interface)) | |
1221 | result) | |
1222 | (dolist (elt (xml-get-children object 'property) result) | |
1223 | (add-to-list | |
1224 | 'result (dbus-introspect-get-attribute elt "name") 'append)))) | |
1225 | ||
1226 | (defun dbus-introspect-get-property (bus service path interface property) | |
1227 | "This function returns PROPERTY of INTERFACE as XML object. | |
1228 | It must be located at SERVICE in D-Bus BUS at object path PATH. | |
1229 | PROPERTY must be a string, element of the list returned by | |
1230 | `dbus-introspect-get-property-names'. The resulting PROPERTY | |
1231 | object can contain \"annotation\" children." | |
1232 | (let ((elt (xml-get-children | |
1233 | (dbus-introspect-get-interface bus service path interface) | |
1234 | 'property))) | |
1235 | (while (and elt | |
1236 | (not (string-equal | |
1237 | property | |
1238 | (dbus-introspect-get-attribute (car elt) "name")))) | |
1239 | (setq elt (cdr elt))) | |
1240 | (car elt))) | |
1241 | ||
1242 | (defun dbus-introspect-get-annotation-names | |
1243 | (bus service path interface &optional name) | |
1244 | "Return all annotation names as list of strings. | |
1245 | If NAME is `nil', the annotations are children of INTERFACE, | |
1246 | otherwise NAME must be a \"method\", \"signal\", or \"property\" | |
1247 | object, where the annotations belong to." | |
1248 | (let ((object | |
1249 | (if name | |
1250 | (or (dbus-introspect-get-method bus service path interface name) | |
1251 | (dbus-introspect-get-signal bus service path interface name) | |
1252 | (dbus-introspect-get-property bus service path interface name)) | |
1253 | (dbus-introspect-get-interface bus service path interface))) | |
1254 | result) | |
1255 | (dolist (elt (xml-get-children object 'annotation) result) | |
1256 | (add-to-list | |
1257 | 'result (dbus-introspect-get-attribute elt "name") 'append)))) | |
1258 | ||
1259 | (defun dbus-introspect-get-annotation | |
1260 | (bus service path interface name annotation) | |
1261 | "Return ANNOTATION as XML object. | |
1262 | If NAME is `nil', ANNOTATION is a child of INTERFACE, otherwise | |
1263 | NAME must be the name of a \"method\", \"signal\", or | |
1264 | \"property\" object, where the ANNOTATION belongs to." | |
1265 | (let ((elt (xml-get-children | |
1266 | (if name | |
1267 | (or (dbus-introspect-get-method | |
1268 | bus service path interface name) | |
1269 | (dbus-introspect-get-signal | |
1270 | bus service path interface name) | |
1271 | (dbus-introspect-get-property | |
1272 | bus service path interface name)) | |
1273 | (dbus-introspect-get-interface bus service path interface)) | |
1274 | 'annotation))) | |
1275 | (while (and elt | |
1276 | (not (string-equal | |
1277 | annotation | |
1278 | (dbus-introspect-get-attribute (car elt) "name")))) | |
1279 | (setq elt (cdr elt))) | |
1280 | (car elt))) | |
1281 | ||
1282 | (defun dbus-introspect-get-argument-names (bus service path interface name) | |
1283 | "Return a list of all argument names as list of strings. | |
1284 | NAME must be a \"method\" or \"signal\" object. | |
1285 | ||
1286 | Argument names are optional, the function can return `nil' | |
1287 | therefore, even if the method or signal has arguments." | |
1288 | (let ((object | |
1289 | (or (dbus-introspect-get-method bus service path interface name) | |
1290 | (dbus-introspect-get-signal bus service path interface name))) | |
1291 | result) | |
1292 | (dolist (elt (xml-get-children object 'arg) result) | |
1293 | (add-to-list | |
1294 | 'result (dbus-introspect-get-attribute elt "name") 'append)))) | |
1295 | ||
1296 | (defun dbus-introspect-get-argument (bus service path interface name arg) | |
1297 | "Return argument ARG as XML object. | |
35b148ee JB |
1298 | NAME must be a \"method\" or \"signal\" object. ARG must be a string, |
1299 | element of the list returned by `dbus-introspect-get-argument-names'." | |
f636d3ca MA |
1300 | (let ((elt (xml-get-children |
1301 | (or (dbus-introspect-get-method bus service path interface name) | |
1302 | (dbus-introspect-get-signal bus service path interface name)) | |
1303 | 'arg))) | |
1304 | (while (and elt | |
1305 | (not (string-equal | |
1306 | arg (dbus-introspect-get-attribute (car elt) "name")))) | |
1307 | (setq elt (cdr elt))) | |
1308 | (car elt))) | |
1309 | ||
1310 | (defun dbus-introspect-get-signature | |
1311 | (bus service path interface name &optional direction) | |
1312 | "Return signature of a `method' or `signal', represented by NAME, as string. | |
1313 | If NAME is a `method', DIRECTION can be either \"in\" or \"out\". | |
1314 | If DIRECTION is `nil', \"in\" is assumed. | |
1315 | ||
1316 | If NAME is a `signal', and DIRECTION is non-`nil', DIRECTION must | |
1317 | be \"out\"." | |
1318 | ;; For methods, we use "in" as default direction. | |
1319 | (let ((object (or (dbus-introspect-get-method | |
1320 | bus service path interface name) | |
1321 | (dbus-introspect-get-signal | |
1322 | bus service path interface name)))) | |
1323 | (when (and (string-equal | |
1324 | "method" (dbus-introspect-get-attribute object "name")) | |
1325 | (not (stringp direction))) | |
1326 | (setq direction "in")) | |
1327 | ;; In signals, no direction is given. | |
1328 | (when (string-equal "signal" (dbus-introspect-get-attribute object "name")) | |
1329 | (setq direction nil)) | |
1330 | ;; Collect the signatures. | |
1331 | (mapconcat | |
4f91a816 SM |
1332 | (lambda (x) |
1333 | (let ((arg (dbus-introspect-get-argument | |
1334 | bus service path interface name x))) | |
1335 | (if (or (not (stringp direction)) | |
1336 | (string-equal | |
1337 | direction | |
1338 | (dbus-introspect-get-attribute arg "direction"))) | |
1339 | (dbus-introspect-get-attribute arg "type") | |
1340 | ""))) | |
f636d3ca MA |
1341 | (dbus-introspect-get-argument-names bus service path interface name) |
1342 | ""))) | |
3a993e3d | 1343 | |
f636d3ca MA |
1344 | \f |
1345 | ;;; D-Bus properties. | |
3a993e3d | 1346 | |
f636d3ca MA |
1347 | (defun dbus-get-property (bus service path interface property) |
1348 | "Return the value of PROPERTY of INTERFACE. | |
1349 | It will be checked at BUS, SERVICE, PATH. The result can be any | |
1350 | valid D-Bus value, or `nil' if there is no PROPERTY." | |
246a286b | 1351 | (dbus-ignore-errors |
dcbf5805 MA |
1352 | ;; "Get" returns a variant, so we must use the `car'. |
1353 | (car | |
1354 | (dbus-call-method | |
1355 | bus service path dbus-interface-properties | |
1356 | "Get" :timeout 500 interface property)))) | |
f636d3ca MA |
1357 | |
1358 | (defun dbus-set-property (bus service path interface property value) | |
1359 | "Set value of PROPERTY of INTERFACE to VALUE. | |
1360 | It will be checked at BUS, SERVICE, PATH. When the value has | |
1361 | been set successful, the result is VALUE. Otherwise, `nil' is | |
1362 | returned." | |
1363 | (dbus-ignore-errors | |
dcbf5805 MA |
1364 | ;; "Set" requires a variant. |
1365 | (dbus-call-method | |
1366 | bus service path dbus-interface-properties | |
1367 | "Set" :timeout 500 interface property (list :variant value)) | |
1368 | ;; Return VALUE. | |
1369 | (dbus-get-property bus service path interface property))) | |
f636d3ca MA |
1370 | |
1371 | (defun dbus-get-all-properties (bus service path interface) | |
1372 | "Return all properties of INTERFACE at BUS, SERVICE, PATH. | |
1373 | The result is a list of entries. Every entry is a cons of the | |
1374 | name of the property, and its value. If there are no properties, | |
1375 | `nil' is returned." | |
f636d3ca | 1376 | (dbus-ignore-errors |
b172ed20 | 1377 | ;; "GetAll" returns "a{sv}". |
f636d3ca | 1378 | (let (result) |
b172ed20 | 1379 | (dolist (dict |
dcbf5805 | 1380 | (dbus-call-method |
b172ed20 MA |
1381 | bus service path dbus-interface-properties |
1382 | "GetAll" :timeout 500 interface) | |
f636d3ca | 1383 | result) |
b172ed20 MA |
1384 | (add-to-list 'result (cons (car dict) (caadr dict)) 'append))))) |
1385 | ||
1386 | (defun dbus-register-property | |
6388924a MA |
1387 | (bus service path interface property access value |
1388 | &optional emits-signal dont-register-service) | |
b172ed20 MA |
1389 | "Register property PROPERTY on the D-Bus BUS. |
1390 | ||
e73f184c MA |
1391 | BUS is either a Lisp symbol, `:system' or `:session', or a string |
1392 | denoting the bus address. | |
b172ed20 MA |
1393 | |
1394 | SERVICE is the D-Bus service name of the D-Bus. It must be a | |
6388924a MA |
1395 | known name (See discussion of DONT-REGISTER-SERVICE below). |
1396 | ||
1397 | PATH is the D-Bus object path SERVICE is registered (See | |
1398 | discussion of DONT-REGISTER-SERVICE below). INTERFACE is the | |
1399 | name of the interface used at PATH, PROPERTY is the name of the | |
1400 | property of INTERFACE. ACCESS indicates, whether the property | |
1401 | can be changed by other services via D-Bus. It must be either | |
1402 | the symbol `:read' or `:readwrite'. VALUE is the initial value | |
1403 | of the property, it can be of any valid type (see | |
b172ed20 MA |
1404 | `dbus-call-method' for details). |
1405 | ||
1406 | If PROPERTY already exists on PATH, it will be overwritten. For | |
1407 | properties with access type `:read' this is the only way to | |
1408 | change their values. Properties with access type `:readwrite' | |
1409 | can be changed by `dbus-set-property'. | |
1410 | ||
1411 | The interface \"org.freedesktop.DBus.Properties\" is added to | |
1412 | PATH, including a default handler for the \"Get\", \"GetAll\" and | |
b1ce08da MA |
1413 | \"Set\" methods of this interface. When EMITS-SIGNAL is non-nil, |
1414 | the signal \"PropertiesChanged\" is sent when the property is | |
6388924a MA |
1415 | changed by `dbus-set-property'. |
1416 | ||
1417 | When DONT-REGISTER-SERVICE is non-nil, the known name SERVICE is | |
1418 | not registered. This means that other D-Bus clients have no way | |
1419 | of noticing the newly registered property. When interfaces are | |
1420 | constructed incrementally by adding single methods or properties | |
1421 | at a time, DONT-REGISTER-SERVICE can be used to prevent other | |
1422 | clients from discovering the still incomplete interface." | |
b172ed20 | 1423 | (unless (member access '(:read :readwrite)) |
dcbf5805 | 1424 | (signal 'wrong-type-argument (list "Access type invalid" access))) |
b172ed20 | 1425 | |
0a203b61 | 1426 | ;; Add handlers for the three property-related methods. |
b172ed20 | 1427 | (dbus-register-method |
0a203b61 | 1428 | bus service path dbus-interface-properties "Get" |
1a27c64e | 1429 | 'dbus-property-handler 'dont-register) |
b172ed20 | 1430 | (dbus-register-method |
1a27c64e MA |
1431 | bus service path dbus-interface-properties "GetAll" |
1432 | 'dbus-property-handler 'dont-register) | |
b172ed20 | 1433 | (dbus-register-method |
1a27c64e MA |
1434 | bus service path dbus-interface-properties "Set" |
1435 | 'dbus-property-handler 'dont-register) | |
0a203b61 | 1436 | |
dcbf5805 MA |
1437 | ;; Register SERVICE. |
1438 | (unless (or dont-register-service (member service (dbus-list-names bus))) | |
0a203b61 | 1439 | (dbus-register-service bus service)) |
b172ed20 | 1440 | |
b1ce08da MA |
1441 | ;; Send the PropertiesChanged signal. |
1442 | (when emits-signal | |
1443 | (dbus-send-signal | |
1444 | bus service path dbus-interface-properties "PropertiesChanged" | |
dcbf5805 | 1445 | `((:dict-entry ,property (:variant ,value))) |
b1ce08da MA |
1446 | '(:array))) |
1447 | ||
b172ed20 MA |
1448 | ;; Create a hash table entry. We use nil for the unique name, |
1449 | ;; because the property might be accessed from anybody. | |
dcbf5805 | 1450 | (let ((key (list :property bus interface property)) |
b1ce08da MA |
1451 | (val |
1452 | (list | |
1453 | (list | |
1454 | nil service path | |
1455 | (cons | |
1456 | (if emits-signal (list access :emits-signal) (list access)) | |
1457 | value))))) | |
b172ed20 MA |
1458 | (puthash key val dbus-registered-objects-table) |
1459 | ||
1460 | ;; Return the object. | |
1461 | (list key (list service path)))) | |
1462 | ||
1463 | (defun dbus-property-handler (&rest args) | |
35b148ee | 1464 | "Default handler for the \"org.freedesktop.DBus.Properties\" interface. |
dcbf5805 | 1465 | It will be registered for all objects created by `dbus-register-property'." |
b172ed20 | 1466 | (let ((bus (dbus-event-bus-name last-input-event)) |
b1ce08da | 1467 | (service (dbus-event-service-name last-input-event)) |
b172ed20 MA |
1468 | (path (dbus-event-path-name last-input-event)) |
1469 | (method (dbus-event-member-name last-input-event)) | |
1470 | (interface (car args)) | |
1471 | (property (cadr args))) | |
1472 | (cond | |
1473 | ;; "Get" returns a variant. | |
1474 | ((string-equal method "Get") | |
dcbf5805 | 1475 | (let ((entry (gethash (list :property bus interface property) |
b1ce08da MA |
1476 | dbus-registered-objects-table))) |
1477 | (when (string-equal path (nth 2 (car entry))) | |
dcbf5805 | 1478 | `((:variant ,(cdar (last (car entry)))))))) |
b172ed20 MA |
1479 | |
1480 | ;; "Set" expects a variant. | |
1481 | ((string-equal method "Set") | |
b1ce08da | 1482 | (let* ((value (caar (cddr args))) |
dcbf5805 | 1483 | (entry (gethash (list :property bus interface property) |
b1ce08da MA |
1484 | dbus-registered-objects-table)) |
1485 | ;; The value of the hash table is a list; in case of | |
1486 | ;; properties it contains just one element (UNAME SERVICE | |
1487 | ;; PATH OBJECT). OBJECT is a cons cell of a list, which | |
1488 | ;; contains a list of annotations (like :read, | |
1489 | ;; :read-write, :emits-signal), and the value of the | |
1490 | ;; property. | |
1491 | (object (car (last (car entry))))) | |
1492 | (unless (consp object) | |
b172ed20 MA |
1493 | (signal 'dbus-error |
1494 | (list "Property not registered at path" property path))) | |
b1ce08da | 1495 | (unless (member :readwrite (car object)) |
b172ed20 MA |
1496 | (signal 'dbus-error |
1497 | (list "Property not writable at path" property path))) | |
dcbf5805 | 1498 | (puthash (list :property bus interface property) |
b1ce08da MA |
1499 | (list (append (butlast (car entry)) |
1500 | (list (cons (car object) value)))) | |
b172ed20 | 1501 | dbus-registered-objects-table) |
b1ce08da MA |
1502 | ;; Send the "PropertiesChanged" signal. |
1503 | (when (member :emits-signal (car object)) | |
1504 | (dbus-send-signal | |
1505 | bus service path dbus-interface-properties "PropertiesChanged" | |
dcbf5805 | 1506 | `((:dict-entry ,property (:variant ,value))) |
b1ce08da MA |
1507 | '(:array))) |
1508 | ;; Return empty reply. | |
b172ed20 MA |
1509 | :ignore)) |
1510 | ||
1511 | ;; "GetAll" returns "a{sv}". | |
1512 | ((string-equal method "GetAll") | |
1513 | (let (result) | |
1514 | (maphash | |
1515 | (lambda (key val) | |
dcbf5805 | 1516 | (when (and (equal (butlast key) (list :property bus interface)) |
b172ed20 | 1517 | (string-equal path (nth 2 (car val))) |
31bb373f | 1518 | (not (functionp (car (last (car val)))))) |
b172ed20 MA |
1519 | (add-to-list |
1520 | 'result | |
1521 | (list :dict-entry | |
1522 | (car (last key)) | |
1523 | (list :variant (cdar (last (car val)))))))) | |
1524 | dbus-registered-objects-table) | |
052e28ac MA |
1525 | ;; Return the result, or an empty array. |
1526 | (list :array (or result '(:signature "{sv}")))))))) | |
b172ed20 | 1527 | |
dcbf5805 MA |
1528 | \f |
1529 | ;;; D-Bus object manager. | |
1530 | ||
1531 | (defun dbus-get-all-managed-objects (bus service path) | |
1532 | "Return all objects at BUS, SERVICE, PATH, and the children of PATH. | |
1533 | The result is a list of objects. Every object is a cons of an | |
1534 | existing path name, and the list of available interface objects. | |
1535 | An interface object is another cons, which car is the interface | |
1536 | name, and the cdr is the list of properties as returned by | |
1537 | `dbus-get-all-properties' for that path and interface. Example: | |
1538 | ||
1539 | \(dbus-get-all-managed-objects :session \"org.gnome.SettingsDaemon\" \"/\") | |
1540 | ||
1541 | => \(\(\"/org/gnome/SettingsDaemon/MediaKeys\" | |
1542 | \(\"org.gnome.SettingsDaemon.MediaKeys\") | |
1543 | \(\"org.freedesktop.DBus.Peer\") | |
1544 | \(\"org.freedesktop.DBus.Introspectable\") | |
1545 | \(\"org.freedesktop.DBus.Properties\") | |
1546 | \(\"org.freedesktop.DBus.ObjectManager\")) | |
1547 | \(\"/org/gnome/SettingsDaemon/Power\" | |
1548 | \(\"org.gnome.SettingsDaemon.Power.Keyboard\") | |
1549 | \(\"org.gnome.SettingsDaemon.Power.Screen\") | |
1550 | \(\"org.gnome.SettingsDaemon.Power\" | |
1551 | \(\"Icon\" . \". GThemedIcon battery-full-charged-symbolic \") | |
1552 | \(\"Tooltip\" . \"Laptop battery is charged\")) | |
1553 | \(\"org.freedesktop.DBus.Peer\") | |
1554 | \(\"org.freedesktop.DBus.Introspectable\") | |
1555 | \(\"org.freedesktop.DBus.Properties\") | |
1556 | \(\"org.freedesktop.DBus.ObjectManager\")) | |
1557 | ...) | |
1558 | ||
1559 | If possible, \"org.freedesktop.DBus.ObjectManager.GetManagedObjects\" | |
1560 | is used for retrieving the information. Otherwise, the information | |
1561 | is collected via \"org.freedesktop.DBus.Introspectable.Introspect\" | |
1562 | and \"org.freedesktop.DBus.Properties.GetAll\", which is slow." | |
1563 | (let ((result | |
1564 | ;; Direct call. Fails, if the target does not support the | |
1565 | ;; object manager interface. | |
1566 | (dbus-ignore-errors | |
1567 | (dbus-call-method | |
1568 | bus service path dbus-interface-objectmanager | |
1569 | "GetManagedObjects" :timeout 1000)))) | |
1570 | ||
1571 | (if result | |
1572 | ;; Massage the returned structure. | |
1573 | (dolist (entry result result) | |
1574 | ;; "a{oa{sa{sv}}}". | |
1575 | (dolist (entry1 (cdr entry)) | |
1576 | ;; "a{sa{sv}}". | |
1577 | (dolist (entry2 entry1) | |
1578 | ;; "a{sv}". | |
1579 | (if (cadr entry2) | |
1580 | ;; "sv". | |
1581 | (dolist (entry3 (cadr entry2)) | |
1582 | (setcdr entry3 (caadr entry3))) | |
1583 | (setcdr entry2 nil))))) | |
1584 | ||
1585 | ;; Fallback: collect the information. Slooow! | |
1586 | (dolist (object | |
1587 | (dbus-introspect-get-all-nodes bus service path) | |
1588 | result) | |
1589 | (let (result1) | |
1590 | (dolist | |
1591 | (interface | |
1592 | (dbus-introspect-get-interface-names bus service object) | |
1593 | result1) | |
1594 | (add-to-list | |
1595 | 'result1 | |
1596 | (cons interface | |
1597 | (dbus-get-all-properties bus service object interface)))) | |
1598 | (when result1 | |
1599 | (add-to-list 'result (cons object result1)))))))) | |
1600 | ||
1601 | (defun dbus-managed-objects-handler () | |
1602 | "Default handler for the \"org.freedesktop.DBus.ObjectManager\" interface. | |
1603 | It will be registered for all objects created by `dbus-register-method'." | |
1604 | (let* ((last-input-event last-input-event) | |
1605 | (bus (dbus-event-bus-name last-input-event)) | |
1606 | (service (dbus-event-service-name last-input-event)) | |
1607 | (path (dbus-event-path-name last-input-event))) | |
1608 | ;; "GetManagedObjects" returns "a{oa{sa{sv}}}". | |
1609 | (let (interfaces result) | |
1610 | ||
1611 | ;; Check for object path wildcard interfaces. | |
1612 | (maphash | |
1613 | (lambda (key val) | |
1614 | (when (and (equal (butlast key 2) (list :method bus)) | |
1615 | (null (nth 2 (car-safe val)))) | |
1616 | (add-to-list 'interfaces (nth 2 key)))) | |
1617 | dbus-registered-objects-table) | |
1618 | ||
1619 | ;; Check all registered object paths. | |
1620 | (maphash | |
1621 | (lambda (key val) | |
1622 | (let ((object (or (nth 2 (car-safe val)) "")) | |
1623 | (interface (nth 2 key))) | |
1624 | (when (and (equal (butlast key 2) (list :method bus)) | |
1625 | (string-prefix-p path object)) | |
1626 | (dolist (interface (cons (nth 2 key) interfaces)) | |
1627 | (unless (assoc object result) | |
1628 | (add-to-list 'result (list object))) | |
1629 | (unless (assoc interface (cdr (assoc object result))) | |
1630 | (setcdr | |
1631 | (assoc object result) | |
1632 | (append | |
1633 | (list (cons | |
1634 | interface | |
1635 | ;; We simulate "org.freedesktop.DBus.Properties.GetAll" | |
1636 | ;; by using an appropriate D-Bus event. | |
1637 | (let ((last-input-event | |
1638 | (append | |
1639 | (butlast last-input-event 4) | |
1640 | (list object dbus-interface-properties | |
1641 | "GetAll" 'dbus-property-handler)))) | |
1642 | (dbus-property-handler interface)))) | |
1643 | (cdr (assoc object result))))))))) | |
1644 | dbus-registered-objects-table) | |
1645 | ||
1646 | ;; Return the result, or an empty array. | |
1647 | (list | |
1648 | :array | |
1649 | (or | |
1650 | (mapcar | |
1651 | (lambda (x) | |
1652 | (list | |
1653 | :dict-entry :object-path (car x) | |
1654 | (cons :array (mapcar (lambda (y) (cons :dict-entry y)) (cdr x))))) | |
1655 | result) | |
1656 | '(:signature "{oa{sa{sv}}}")))))) | |
1657 | ||
b172ed20 | 1658 | \f |
dcbf5805 | 1659 | ;; Initialize `:system' and `:session' buses. This adds their file |
720c7cd6 MA |
1660 | ;; descriptors to input_wait_mask, in order to detect incoming |
1661 | ;; messages immediately. | |
9e846523 MA |
1662 | (when (featurep 'dbusbind) |
1663 | (dbus-ignore-errors | |
dcbf5805 MA |
1664 | (dbus-init-bus :system)) |
1665 | (dbus-ignore-errors | |
9e846523 | 1666 | (dbus-init-bus :session))) |
720c7cd6 | 1667 | |
3a993e3d MA |
1668 | (provide 'dbus) |
1669 | ||
dcbf5805 MA |
1670 | ;;; TODO: |
1671 | ||
1672 | ;; * Implement org.freedesktop.DBus.ObjectManager.InterfacesAdded and | |
1673 | ;; org.freedesktop.DBus.ObjectManager.InterfacesRemoved. | |
1674 | ||
3a993e3d | 1675 | ;;; dbus.el ends here |